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Study participants who slept four hours a night ate an average of 22% more calories than those who slept eight hours. Researchers say sleep deprivation could be "one of the environmental factors that contribute to the obesity epidemic."

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Teens who had just four hours of sleep the night before taking a simulated pedestrian safety test had more close calls or hits by cars while crossing the street than their well-rested peers, according to a study in the Journal of Adolescent Health. Sleep-deprived teens also took more time before starting to cross the street. The findings suggest that even one sleep-deprived night can influence the ability of young people to safely cross the street.

Australian researchers surveyed nearly 20,000 17- to 24-year-old drivers and found that those who said they slept six hours or less every night had a 21% higher risk of being involved in a car accident than those who got more sleep. Sleep-deprived drivers were more likely to get into an accident during weekends and between midnight and 6 a.m., according to the study published in the journal JAMA Pediatrics.

Study participants who slept four hours a night ate an average of 22% more calories than those who slept eight hours. Researchers say sleep deprivation could be "one of the environmental factors that contribute to the obesity epidemic."

Study participants who slept four hours a night ate an average of 22% more calories than those who slept eight hours. Researchers say sleep deprivation could be "one of the environmental factors that contribute to the obesity epidemic."

Study participants who slept four hours a night ate an average of 22% more calories than those who slept eight hours. Researchers say sleep deprivation could be "one of the environmental factors that contribute to the obesity epidemic."